TRIGONOMETRIC FUNCTIONS - EXERCISE 2
Evaluate (give an exact answer).
If and , find
(give an exact answer).
(a) Observe that
5 whole revolutions . Since has period ,
it follows that
. The angle
lies in the third quadrant and has as reference angle,
therefore is a point on the angle and on the unit
circle, from which we obtain:
(b) Observe that
which we obtain that .
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